JAMB Physics 2014 Objective — Question 40
Question 40 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.
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What is the best method of demagnetizing a steel bar magnet?
- A. Heating it
- B. Rough handling it
- C. Solenoid methodCorrect
- D. Hammering
Explanation
The electrical method (solenoid method) is the best way to demagnetize a magnet, as it gives controlled, gradual demagnetization.
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